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Earnings Per Common Share (Tables) | 3 Months Ended
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Mar. 31, 2013
Earnings Per Share [Abstract] |
Numerators and Denominators Used in Computations of Basic and Diluted Earnings Per Common Share |
| Reconciliations of the numerators and denominators used in the computations of basic and diluted earnings per common share were as follows, in millions:
|  | Three Months Ended March 31, |
|  | 2013 |  |  | 2012 |
Numerator (basic and diluted): |  |  |  |  |  |  |  |
Income from continuing operations |  | $ | 56 |  |  | $ | 42 |
Allocation to unvested restricted stock awards |  |  | (1 | ) |  |  | (1 | )
Income from continuing operations attributable to common shareholders |  | $ | 55 |  |  | $ | 41 |
Loss from discontinued operations, net |  |  | (9 | ) |  |  | (9 | )
Net income available to common shareholders |  | $ | 46 |  |  | $ | 32 |
Denominator: |  |  |  |  |  |  |  |
Basic common shares (based upon weighted average) |  |  | 350 |  |  |  | 349 |
Add: |  |  |  |  |  |  |  |
Contingent common shares |  |  | — |  |  |  | — |
Stock option dilution |  |  | 2 |  |  |  | 1 |
Diluted common shares |  |  | 352 |  |  |  | 350 |

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- Definition Tabular disclosure of the numerators and the denominators of the basic and diluted per-share (or per-unit) computations for income from continuing operations, including the effect that has been given to preferred dividends. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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